2 replies so far

How high are we talking? If it were me, and I am by no means an architect, I would sink some PT 4×4 posts in concrete at the corners, then lag bolt some 2×8s around, and build the rest like a shed, or standard house.

New Hampshire and New York (where I am from) share a similiar wintertime cllimate. So I suggest that you look up code (I know, I know this is a play house, not a year round structure, not supporting a lot of weight etc.) But look up code anyway and determine what the general concensus is related to the “frost line” in the area. Anything you do should penetrate that layer (let’s call it 3 feet for arguement’s sake) in order to remain stable. In generally this usually means digging the footing a little deeper, no big deal. After that grab some concrete tubes from the homestore drop your 4X4s in there and fill with bagged mix cement until you are just below the surface. Frame out the floor structure with 2X8, 8 inches on center and you got yourself a bombproof structure.

If that all seems too intense for a play house, it is, but if you are anything like me, right is right. If you want to raise it off the ground and make it sound do it like you would build a house and for the same reasons.